Malicious PDF — malware analysis report

Static analysis result for SHA-256 683632f2c384a29c…

MALICIOUS

PDF

37.4 KB Created: 2020-09-16 21:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80a10a03875d42f475a0bf701e432d0e SHA-1: 20ce84fbd55bd8443a0a2d317e41693923c9a053 SHA-256: 683632f2c384a29c22692773433dfea5c63f89319f5564ef26f2edcb9f0ee176
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, with at least one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of numerous links suggests an attempt to direct users to potentially harmful sites, possibly for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=l+blends+picture+cards
    • http://files.easterndistrictbudgie.com/uploads/1/3/1/8/131871651/robitiripuga-wupumiwediku-karisives.pdf
    • http://sinedawe.kahua-ranch.com/uploads/1/3/1/0/131071243/8715333.pdf
    • http://files.toowoombakoalarescue.org/uploads/1/3/1/3/131383510/raroku.pdf
    • http://netoduwu.penguinslax.com/uploads/1/3/0/9/130969057/9c0dc67c8d800.pdf
    • http://gumovufo.sardisdoorway.com/uploads/1/3/2/8/132814930/6956819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a839446c-33f1-4011-8cec-647f2cd88f45.filesusr.com/ugd/38eac1_63f14b3b257f466ba019821bac55fdea.pdf?index=true
    • https://c51dc86e-16f3-43b2-85fc-0862488fa751.filesusr.com/ugd/daca0d_823c39c8208c4b66a33891bed7c5a7c8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0466/2309/6997/files/17491761944.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0437/4095/4773/files/36140849682.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051ec.bin
a8f846a1e6a189373ada0b0d8a741c45e27bdd5191ff43939be7529205c2bdce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51EC 5148 bytes
font_01_sfnt_off00006372.bin
918e4f21417faa4398c9be7e9c01f93cb248c62518b6436797a40009b397c0c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6372 11736 bytes

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